Indesign freezes at startup "Executing startup services..."

Somehow your post has been marked "Assumed Answered". If you want people to respond you will have to change its setting to "Not Answered".

That being said have you tried the following?

Trash your preferences.

To do so:

ou can try the quick way of resetting on a PC which is to hold down Ctrl + Alt + Shift when launching InDesign and respond affirmatively when asked if you want to reset. There have been some recent reports that the window asking if you want to reset is not popping up but that the prefs are being reset anyway. If this works great but if it doesn’t you may have to manually delete them.

To do so:

On Windows 7 and above the preference files are hidden. To find them go to the Control Panel and open Folder Options and then click the View tab. Then select “Show hidden files and folders” or “Show hidden files, folders or drive options” in Advanced Settings. Then delete (or rename) the folder at the end of this path: C:\Users\<USER>\AppData\Roaming\Adobe\InDesign\<Version #>\<Language>. Make sure that InDesign is closed when you do this. When you relaunch the program it will create  new preference files and the program will be at its default settings.

The advantage of manually deleting preference files is that after you’ve reset up the program (make sure that no document window is open) to your liking, you can create copies of your personalized “mint” preference files (make sure that you quit the program before copying them—that finalizes your customization) and use them in the future to replace any corrupt versions you may need to delete.

Uninstall and reinstall.

To do so:

In the app section of your Creative Cloud desktop app click on the “V” next to the app’s (InDesign) name and choose the “Uninstall” option from the pull-down menu that appears. After you’ve run the uninstall then use the Creative Cloud Cleaner Tool Use the Creative Cloud Cleaner Tool to solve installation problems  . Then reinstall the program through the Desktop app. Before you reinstall, once again trash all preference files to make sure that your install is completely clean. Then launch InDesign and see if the problem persists.

Also you mentioned that it had been a couple of weeks since you opened the program. The most recent update of Windows 10 has caused problems for many people so your problems may be related to the update.